Standardize usage of virtual/override/final specifiers.

ash/shell/bubble.cc

Index: ash/shell/bubble.cc
diff --git a/ash/shell/bubble.cc b/ash/shell/bubble.cc
index 00e80e6792a822ede901abbea370f9fa954c5367..5c157ee1eac548a8bb12509fe23f0313e9a87ef9 100644
--- a/ash/shell/bubble.cc
+++ b/ash/shell/bubble.cc
@@ -24,7 +24,7 @@ class ExampleBubbleDelegateView : public views::BubbleDelegateView {
       : BubbleDelegateView(config.anchor_view, config.arrow),
         label_(config.label) {}

[James Cook, 2014/10/27 23:45:34]

Likewise, do you think this needs ~ExampleBubbleDelegateView() override {} ?  It
has a non-trivial member.

[dcheng, 2014/10/27 23:47:55]

Ditto.

 
-  virtual void Init() override {
+  void Init() override {
     SetLayoutManager(new views::FillLayout());
     views::Label* label = new views::Label(label_);
     AddChildView(label);